Finally someone has cleared this up!

For centuries, Hindu women have worn a dot on their foreheads. Most of us have naively thought this was connected with tradition or religion, but the Indian embassy has recently revealed the true story.

When a Hindu women gets married, she brings a dowry into the union. On her wedding night, the husband scratches off the dot to see whether he has won a convenience store, a gas station, a donut shop, a taxi cab, or a motel in the United States. If nothing is there, he must remain in India to answer telephones and provide us with technical advice.